鼠标,键盘,ps/2,usb,串口,转换接线方法(图)
一．ps/2鼠标转USB：
不是所有PS/2鼠标都可以改为USB鼠标的,可以改的PS/2鼠标的特征:
A.电路板一般带有两块集成电路,(一块光电感应,一块按键或USB
协议
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转换,和一只24M的晶体振荡器--早期PS/2鼠标.)
B.后期的PS/2鼠标只有一块光电感应芯片,但也有一只24M晶体振荡器.
可以改的PS/2鼠标一般都带有晶体振荡器,如果按图改了,但电脑检测出为未知USB设备,而非鼠标设备,说明该PS/2鼠标不能改为USB鼠标了.
二.ps/2键盘转USB：
到目前为止我所知的ps/2键盘,这是不可能的,只能买个USB T0 PS2 带芯片的转换线吧.
三.ps/2鼠标转串口(RS232)：
PS/2鼠标口公插头图,RS-232串口公插头图
接线
PS/2公插头 串口公插头
+5V 4 4+7+9 DTR+RTS+TR
Data 1 1 CD
Gnd 3 3+5 TXD+GND
Clock 5 6 DSR
绝大部分鼠标改接后可直接使用.
四.ps/2键盘转串口(RS232)：
如上图及接法,
但需要对串口编程,设计一个RS232串口信号转标准PS/2键盘信号的程序,实现模拟键盘输入数字或字符
What`s the purpose of holidays? What do people do on holidays?
Good morning, Miss Tu! How are you?
When I got this topic, instantly I thought that it may be different with different people in different life-stages.
First, as for children, they eager to have holidays since they love playing. During the holidays, many of them gather together. They play games and run everywhere, and they feel extremely happy from doing that. Also, they will have to take a few days to do their homework, even if they do not like to.
Second, to the people who have started to work after graduation, everyday they face great pressure from their work, so they hope that the purpose of their holidays is to enjoy the life without any tense. During their holidays, they may want to have a good sleep or go to see their best friends or even travel some place for fun. Well, I think these people also have a responsibility that they must have to see their parents who have waited for them at home for long time.
Third, the old have their own ideas, too. Of course there may be some of them who want to travel outside to see the world. However, most of them eagerly wish that they can be accompanied by their children and they are very satisfied with the famliy union.
In conclusion, the purpose of holidays is different with different people and the things they do are also not the same.
And that`s all. Thank you!
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